This is not my fish, it's from a breeders page.. he breeds and also buys Bettas and resells them.

I've never seen this before on a Betta and right now these are the only two photos available of him. I would like to know if anyone has any ideas as to what it could be so I can try and help the owner out.

Edit:

He says the fish has had this since he was young, it almost looks like a type of lymphocystis except it's black and not white.

Last edited by TheCheese909; 01-05-2013 at 03:24 AM.
Reason: Added more info